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Sketching a Catenary

Question asked by Jordan Richards on Jan 23, 2014
Latest reply on Apr 17, 2015 by Jarred Mosdal

I'm trying to use the equation driven curve tool to sketch a catenary y=a*cosh(x/a) but keep getting told that it is an invalid equation. I generated some random data to test P1 (0,0) P2 (0,10) S=15 h=10 v=0 I found a to be 0.7365. Anyone care to tell me why the equation is invaild?